How Did the Interior Designer make MEP Spaces Disappear?

I have seen a number of reasons MEP Spaces disappear or not possible to place to being with. I will share one a dealt with recently. And to be fair, for this example, anyone working in the architectural model could cause this problem for the MEP team, not just the interior designers:) I do cover the thing that causes the problem in my interior design book, but when done as instructed this problem can be avoided.

First, we have an architectural model with'''

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